Is yours a newer unit, or an older one? Some of the older units had a fixed
270uH inductor as a tuning element in the 1st 455kHz I.F. stage. This is in
parallel with a 470pF chip cap. Sometimes, the tolerances of that fixed
inductor would cause a loss in sensitivity. If this is the case, it can be
replaced with a variable inductor. I did that with mine, and the NF
improved quite a bit, to the point of having an MDS of .1uV down to 200kHz,
degrading to .3uV at 100kHz. Another thing that helps this radio below
500kHz quite a bit is having a good ground. I use a power supply that has a
3 wire cord, and having that ground connection improves the low end signals
by around 3 S-units.

Pete

J999w wrote in message
...
Why?

I just bought one for backpacking miniDXpeditions. I like it, it only
weighs 2
lbs without batteries, does not overload on MW even with 700 ft of wire
and a
5kw directional local 2 miles away. My only complaint so far is that it is
deaf
below 500khz. THe sensitivity is something like 2uv ... horrible ! I hope
there
will be a mod for this.

Very nice radio though !

jw
wb9uai
P.S. Stay tuned for the write up on my first backpacking miniDXpedition
....
gotta copy some of the audio off the cassette first.)